Legend:

If you omit step (3), then `darcs-all` will pull patches into the GHC repository too. If one of those patches modifies the `darcs-all` script itself, then bizarre things can happen (or at least: in the past, they could happen.) The safe thing to do is to get your main `ghc` repo up to date (step 3) and then run the script.

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If you see the following error message on Windows (the filename varies)